#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Constants, Varaibles, Types, Reference
# 常量，变量，类型，引用
print('Helloworld')
print(isinstance('Helloworld', int))

int  # 
1
2

...

float

1.0
2.0

...


bool
True == 1
False == 0

No = '201708010101'

No = int(No)
print(No, type(No))

